Hernandez-Guereca crime scene following the altercation between U.S. border agents and alleged "Mexican illegal aliens."

According to law enforcement reports, fifteen-year old Sergio Hernandez-Guereca was shot in his head as U.S. Customs and Border Protection agents tried to detain two men who had crossed into the United States illegally near the Paso del Norte Bridge in El Paso, Texas. The teenager was pronounced dead at the scene.  

A federal law enforcement officer told the Law Enforcement Examiner that Hernandez was with a gang of youths throwing rocks at the agents. The anonymous law enforcement source stated that witnesses claimed one agent fired several shots toward the group, but the still unidentified agent claimed he acted in self-defense.

Mexican officials, including President Felipe Calderón, denounced the teen's death. The country's secretary of state said the use of firearms was a "disproportionate use of force" in response to rock throwing.